反应详情

A solution of methyl 5-cyano-2-hydroxy-5-(2-methylpyrimidin-5-yl)cyclohex-1-enecarboxylate (6.2 g, 0.023 mol), NaCl (1.46 g, 0.025 mol) and H2O (1.24 mL, 0.069 mol) in DMSO (50 mL) was heated to 160° C. for 3 h. After cooling to room temperature, the reaction was added water and extracted with EtOAc (6×100 mL). The organic layer was washed with brine, dried over Na2SO4 and concentracted. The crude product was purified by flash chromatography(EtOAc: Petroluem ether=1:3˜3:2) to give 1-(2-methylpyrimidin-5-yl)-4-oxocyclohexanecarbonitrile (2 g, yield: 41%). 1H NMR (CDCl3 400 MHz): δ8.80 (s, 2H), 3.00-2.90 (m, 2H), 2.77 (s, 3H), 2.70-2.60 (m, 2H), 2.60-2.50 (m, 2H), 2.40-2.25 (m, 1H).

1. extractionextracted with EtOAc (6×100 mL)
2. washThe organic layer was washed with brine
3. dry with materialdried over Na2SO4
4. customThe crude product was purified by flash chromatography(EtOAc: Petroluem ether=1:3˜3:2)